Bloglines

Bloglines is a
web-based personal news aggregator that can be used in place of a
desktop client.

This is a server-based aggregation system, in which software
and technology is automatically handled to collect syndicated feeds
from 80 million online information sources, and deliver that
content to users as a free, easy-to use online service.

The software allows users to search for, read and share
any updates from your favorite news feed or blog regardless of its
authoring technology.

Bloglines also offers an application programming interface
that can be used to write software that can read feeds, search its
database of feed entries, and ping the service when a blog has been
updated.